amazon.com has a 6-Count of Sharpie Permanent Markers Variety Pack for $6.50. Shipping is free with Prime or on orders over $25.
Chase Ink Business Cash Credit Card is offering $750 bonus cash back after qualified spending. It also offers up to 5% cash back on purchases at office supply stores and on internet, cable and phone services, and 2% cash back on purchases at gas stations and restaurants.
In addition, it has no annual fee.